The answer is:  [A]:  troposphere .
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They are both on the end of the Pacific rim. They both have an above average number of volcanoes, and they are steeper and more narrow then other mountain ranges. This is a result of their both straddling and colliding continental plates and being on top of very active geological fault lines.
        
             
        
        
        
Answer:
convergence between a continental plate and an oceanic plate
Explanation:
The Andean Mountain Range has been formed because of volcanic activity. This has happened because of a convergent plate boundary between two plates.
More specifically, the convergent plate boundary is between the continental South American plate and the oceanic Nazca plate. The Nazca plate is lower, denser, heavier, and it is moving below the South American plate, creating a subduction zone. 
Where the boundary is between the two plates, the mantle manages to push through magma upwards through the cracks in the crust. This magma managed to get to the surface, lift up the land and create volcanoes, creating a continental volcanic arc parallel to the plate boundary, over time becoming the enormous Andean Mountain Range.
 
        
             
        
        
        
The P wave can move through solid rock and fluids, like water or the liquid layers of the earth. It pushes and pulls the rock it moves through just like sound waves push and pull the air. ... P waves are also known as compressional waves, because of the pushing and pulling they do.